| Topic: |
Science > Physics |
| User: |
"Sam Wormley" |
| Date: |
08 Jan 2007 07:57:05 PM |
| Object: |
Dark-matter map points to galaxy formation |
Dark-matter map points to galaxy formation
http://physicsweb.org/articles/news/11/1/3/1
8 January 2007
The Universe is permeated by filaments of invisible dark matter that
intersect at galaxies and other major structures. This is the
conclusion of astronomers from the Cosmic Evolution Survey (COSMOS),
who have created the first large-scale map of the distribution of
dark matter. The apparent overlap of dark matter filaments with
galaxies and other massive structures adds further weight to the
theory that the Universe owes its structure to the gravitational pull
of dark matter (Nature doi:10.1038/nature05497).
Dark matter is fundamentally different from normal "luminous" matter
that makes up stars, planets and humans. It is invisible to modern
telescopes, giving off no light or heat, and it seems to interact
with normal matter only through gravity. Although dark matter has
never been observed directly, most cosmologists believe dark matter
plays a crucial role in how large structures such as galaxies emerged
after the Big Bang.
See: http://physicsweb.org/articles/news/11/1/3/1
.
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| User: "Thierry" |
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| Title: Re: Dark-matter map points to galaxy formation |
09 Jan 2007 04:15:50 AM |
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"Sam Wormley" <swormley1@mchsi.com> wrote in message
news:RDCoh.298211$FQ1.116039@attbi_s71...
Dark-matter map points to galaxy formation
http://physicsweb.org/articles/news/11/1/3/1
A more stunning gimage is available here
http://hubblesite.org/newscenter/archive/releases/2007/01/image/a/
Thierry
http://www.astrosurf.com/luxorion/
8 January 2007
The Universe is permeated by filaments of invisible dark matter that
intersect at galaxies and other major structures. This is the
conclusion of astronomers from the Cosmic Evolution Survey (COSMOS),
who have created the first large-scale map of the distribution of
dark matter. The apparent overlap of dark matter filaments with
galaxies and other massive structures adds further weight to the
theory that the Universe owes its structure to the gravitational pull
of dark matter (Nature doi:10.1038/nature05497).
Dark matter is fundamentally different from normal "luminous" matter
that makes up stars, planets and humans. It is invisible to modern
telescopes, giving off no light or heat, and it seems to interact
with normal matter only through gravity. Although dark matter has
never been observed directly, most cosmologists believe dark matter
plays a crucial role in how large structures such as galaxies emerged
after the Big Bang.
See: http://physicsweb.org/articles/news/11/1/3/1
.
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| User: "Sam Wormley" |
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| Title: Re: Dark-matter map points to galaxy formation |
08 Jan 2007 08:03:29 PM |
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Sam Wormley wrote:
Dark-matter map points to galaxy formation
http://physicsweb.org/articles/news/11/1/3/1
8 January 2007
The Universe is permeated by filaments of invisible dark matter that
intersect at galaxies and other major structures. This is the
conclusion of astronomers from the Cosmic Evolution Survey (COSMOS),
who have created the first large-scale map of the distribution of
dark matter. The apparent overlap of dark matter filaments with
galaxies and other massive structures adds further weight to the
theory that the Universe owes its structure to the gravitational pull
of dark matter (Nature doi:10.1038/nature05497).
Dark matter is fundamentally different from normal "luminous" matter
that makes up stars, planets and humans. It is invisible to modern
telescopes, giving off no light or heat, and it seems to interact
with normal matter only through gravity. Although dark matter has
never been observed directly, most cosmologists believe dark matter
plays a crucial role in how large structures such as galaxies emerged
after the Big Bang.
See: http://physicsweb.org/articles/news/11/1/3/1
Mapping the Invisible
http://sciencenow.sciencemag.org/cgi/content/full/2007/108/2
By Govert Schilling
ScienceNOW Daily News
8 January 2007
SEATTLE, WASHINGTON--Like a plate of spaghetti and meatballs thrown
against a wall, a new 3-D map indicates that dark matter is scattered
throughout the universe as a series of large clumps connected by
elongated filaments. The findings, which are the result of one of the
largest celestial observing campaigns ever undertaken, confirm theories
about how the universe evolved and may shed light on the nature of the
mysterious force known as dark energy.
Cosmologists believe the observed distribution of stars and galaxies in
the universe was determined by dark matter, an invisible substance
thought to make up about 85% of all matter in the universe (ScienceNOW,
5 January 2007). Dark matter clumped together first, and normal matter
then flowed toward the densest regions, where it condensed into
galaxies and stars. "Dark matter is like the scaffolding of the
universe," says Richard Massey of the California Institute of
Technology in Pasadena.
See: http://sciencenow.sciencemag.org/cgi/content/full/2007/108/2
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